Specifications

Comfort Reference Value – 5th Generation of STÖBER Inverters STÖBER
ANTRIEBSTECHNIK
4. Representing the Reference Values in User Units
KSW-13
4.4 Switching between Master/Slave Drive in Speed/Speed Mode
Information that you will find in
this section …
This section explains how to scale the reference values in user units with a master/slave
drive with speed/speed switchover. Before you can begin scaling you must have
activated "switch master/slave drive" with “speed/speed switchover” (Umschaltung
Drehzahl/Drehzahl) on page 1 of the Assistant.
Scaling the reference value
Figure 4-8 shows page 2.4 of the Assistant. It presents the structure of a machine with
motor, gear unit and other ratios.
Figure 4-8 Scaling for reference value type "master/slave drive" in "speed/speed" mode
First, edit the parameters on the top of the page (Figure 4-9):
• In D86 specify the number of decimal digits with which speeds are to be represented.
• In D89 enter the desired unit of measurement for the speed (e.g., compartments per
second). Remember that not more than 8 characters can be entered.
• Activate the option box as per your entry in D89 so that the time reference can be
correctly calculated internally.
Example: You have entered compartments/second in D89. In this case you would
activate the option box "/sec" as the time reference.
• Enter the rated speed of the machine in D56.
Figure 4-9 Parameter D86, D89 and D56
You can now enter the gear ratios within the lower range of the page (Figure 4-10).
There are two ways to do this:
1. You already know the mathematical relationship between the speed of the motor in
rpm and the speed of the machine in user units. If this is the case, enter the ratio
directly in D87 numerator (machine speed) and D88 denominator (motor speed).